Optimization of electro-Fenton in the advanced treatment of coal chemical industry wastewater by response surface methodology

To obtain the optimal process parameters,the orthogonal test and response surface methodology coupled with central composite design were applied in the optimization of electro-Fenton process as advanced treatment of coal chemical industry wastewater,and a quadratic model was developed to predict the treatment performance. The results showed that the factors affecting TOC removal in descending order was p H,current density and Fe2 +concentration according to the orthogonal test. The developed quadratic model could predict the response accurately,and the optimal parameters were determined as p H 4. 13,1. 56 mmol / L of Fe2 +and14. 74 m A / cm2 of current density,with the predicted optimal TOC removal efficiency of 61. 58%. The electro-Fenton could serve as a effective technology for the advanced treatment of coal chemical industry wastewater.